Which of the following is the number of oscillations per unit time of the sound wave?

Correct option is D

The correct answer is (d) Frequency.
· Frequency is the number of oscillations or vibrations per unit time of a sound wave.
· It is measured in Hertz (Hz), and higher frequencies correspond to higher-pitched sounds.
Other Options:
· Wavelength: The distance between two consecutive points of a wave in the same phase, not the number of oscillations.
· Time period: The time taken for one complete oscillation, not the number of oscillations.
· Amplitude: The maximum displacement of a point on a wave from its rest position, not related to the number of oscillations per unit time.